I actually have heard of this concern, but I believe that it began from a source who didn’t truly understand the movement. It was being compared to the straight-legged sit-up, which we all should have the controversy and studies related to this exercise. The concern was the supposed strain that the rollup could pace on the cervical spine and back, which is the concern with straight-legged sit-up. The only true contraindications that exist with the roll-up are with persons who are pregnant, have osteoporosis or spinal stenosis. Otherwise, I believe that like all exercises, if done properly, there should be no concern with this exercise.